If you have a file server and you want get know how much data you will be able save if migrate to Server 2012 , copy from Windows Server 2012 from path c:\windows\system32\ you will found tool ddpeval.exe (or you can download this tool „ddpeval.zip“ from skydrive on main page of marwin.e-blog.cz)

This tool only show you, how much data You will be able to save. This tool does not deduplicate ! Examples

ddpeval.exe \\dchv\d

or

ddpeval.exe :d

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In pictures below you can see how turn on deduplication on the server and result of real deduplication

FIRST „enable deduplication data“ ( feature of file server role ),

Deduplicate features works with local disks, volumes , no remote network store, remote network shares